Объяснить поведение программы

import java.awt.*;
import java.io.*;
 
/**
 * Created by αδμιν on 20.12.2016.
 */
 
class Collar extends JHF_TESTS_Save_Object_W_R{
    Collar(){
        ItemColor = new Color(70,70,70);
        modelName = "Wild";
    }
    Collar(int R, int G, int B, String model){
        ItemColor = new Color(R,G,B);
        modelName = model;
    }
    Color ItemColor;
    String modelName;
}
public class JHF_TESTS_Save_Object_W_R implements Serializable {
    JHF_TESTS_Save_Object_W_R(){
        testCollar = new Collar(64,64,64,"Blacky");
    }
 
    Boolean colorTestPassed;
    Collar testCollar;
 
    public static void main(String[] args) {
        JHF_TESTS_Save_Object_W_R jhf_tests_save_object_w_r = new JHF_TESTS_Save_Object_W_R();
        jhf_tests_save_object_w_r.colorTestPassed =true;
        JHF_TESTS_Save_Object_W_R jhf_tests_save_object_w_r11 = new JHF_TESTS_Save_Object_W_R();
        try {
 
            ObjectOutputStream objectOutputStream = new ObjectOutputStream(new FileOutputStream("D:/Downloads/STest.ser"));
            objectOutputStream.writeObject(jhf_tests_save_object_w_r);
            objectOutputStream.close();
        }
        catch (Exception ex){
            ex.printStackTrace();
        }
        finally {
            System.out.println(jhf_tests_save_object_w_r);
        }
        jhf_tests_save_object_w_r = null;
        try {
 
            ObjectInputStream objectInputStream = new ObjectInputStream(new FileInputStream("D:/Downloads/STest.ser"));
 
            jhf_tests_save_object_w_r11 = (JHF_TESTS_Save_Object_W_R) objectInputStream.readObject();
            objectInputStream.close();
        }
        catch (Exception ex){
            ex.printStackTrace();
        }
        finally {
            System.out.println(jhf_tests_save_object_w_r11);
        }
if (jhf_tests_save_object_w_r.equals(jhf_tests_save_object_w_r11)){
            System.out.println("OK");
        }
    }
 
}

Exception in thread "main" java.lang.StackOverflowError
    at Collar.<init>(JHF_TESTS_Save_Object_W_R.java:14)
    at JHF_TESTS_Save_Object_W_R.<init>(JHF_TESTS_Save_Object_W_R.java:23)
    at Collar.<init>(JHF_TESTS_Save_Object_W_R.java:14)
    at JHF_TESTS_Save_Object_W_R.<init>(JHF_TESTS_Save_Object_W_R.java:23)
    at Collar.<init>(JHF_TESTS_Save_Object_W_R.java:14)